[1] "Round Hill River" "Meteghan River" "Salmon River"
[4] "Liscomb River" "Musquodoboit River" "Gold River"
[7] "LaHave River" "Mersey River" "Grand River"
[10] "Roseway River" "Middle River" "North River"
[13] "Tusket River" Flagging Inland Data - Rolling SD
Inland Parameters: Explore Thresholds
Summary
CMAR has collected data on several inland bodies of freshwater in Nova Scotia through the wild Atlantic salmon river monitoring project. In addition, CMAR has data collected on several freshwater lakes (e.g. Piper Lake), which is currently published through the Water Quality branch of the Coastal Monitoring Program.
CMAR intends to process and republish all inland data under a new “Inland” branch of the Coastal Monitoring Program. Data will be processed in a similar manner to the water quality data, and data flags will be applied using the qaqcmar package.
It is suspected that sensors on some rivers were out of the water for some period of time during the deployment. Data flagging efforts will flag data for periods of time sensors were suspected to be exposed. During the periods in which sensors were exposed to air, recorded temperatures fluctuate more quickly than when sensors are submerged.
The purpose of this document is to help CMAR determine appropriate data flagging tests and thresholds for freshwater (inland) data. We do not currently have enough freshwater data to conduct as thorough an analysis as was done on the saltwater water quality data to develop tests and thresholds, so thresholds may be picked in more subjective ways.
Waterbodies in dataset:
Stations in dataset:
[1] "Round Hill River 1" "Round Hill River 2" "Round Hill River 3"
[4] "Meteghan River 1" "Meteghan River 2" "Meteghan River 3"
[7] "Salmon River 1" "Salmon River 2" "Liscomb River 1"
[10] "Liscomb River 2" "Musquodoboit River 1" "Musquodoboit River 2"
[13] "Musquodoboit River 3" "Gold River 2" "LaHave River 1"
[16] "LaHave River 2" "LaHave River 3" "Mersey River 2"
[19] "Grand River 1" "Grand River 2" "Grand River 3"
[22] "Roseway River 1" "Roseway River 2" "Middle River 1"
[25] "Middle River 2" "Middle River 3" "North River 1"
[28] "Tusket River 1" "Tusket River 2" "Tusket River 3" Stations which may have experienced air exposure:
- Liscomb 1
- Liscomb 2
- LaHave 2
- Mersey 2
- Tusket 3
- Possibly Musquodoboit 1 and 2
Station locations
Approximate location of stations included in analysis.
Plot all station data
Plot cleaned station data
Suspected outliers have been removed from the following datasets:
- Liscomb 1
- Liscomb 2
- LaHave 2
- Mersey 2
- Tusket 3
Distribution plots
Distribution of sd_roll
Distribution all
Generate thresholds
Visualize flagged data
Mean_sd
Quartile
Quartile pooled 0.95
Quartile pooled 0.97
Quartile pooled 0.99
Quartile pooled 0.997
Apply rolling SD threshold
Due to the right-skew of the sd_roll distribution plots, the quantile method was used to establish thresholds. Because the overall distribution of the data was relatively the same for each station, all station data was pooled before determining a threshold and applying the test.
The final threshold value chosen was q99.7: 2.04